P200E - 24/24 - Up Jetting
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Enthusiast
1981 Vespa P200E
Joined: 14 Sep 2010
Posts: 66
Location: Whitby, Canada
Tue Jul 09, 2019 6:28 am quote
I have been searching the forum for the answers and I'm not coming up with what I need.
So, I reach out to the tech guru's of the Inter-webs.

My scoot is a 1981 Vespa P200E. It has a 24/24 carb with:
-Idle Jet: 55/160
Main Jet Stack:
-Air Jet: 160
-Mixer Tube: BE3
-Main Jet: 116

I want to install the Chrome SIP Road 2. The up jet I was thinking is a Main 122-124.

Does this sound right to you?
What else should I change?

Thank you

Robin

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Addicted
1974VLB 1979VSX 1974V9A
Joined: 12 Sep 2014
Posts: 656

Tue Jul 09, 2019 8:31 am quote
Normally you up jet 2-4 point. The chrome version may need more because itís lack some baffling stuff in the box. Beware, those exhausts are pretty loud and tinny sounding compared to the painted version.
Enthusiast
1981 Vespa P200E
Joined: 14 Sep 2010
Posts: 66
Location: Whitby, Canada
Tue Jul 09, 2019 9:24 am quote
PureDrivenSnow,
The tinny sound is what I'm looking for.

So, if this model originally came with a 20/20 back in 1981 and now is a 24/24, would this change the equation for up jetting?

Also compounded, Since the Chrome does not have sound attenuation, would this also affect the jetting equation again?

Robin
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 63 Li125, 65 Li225 Silver Special, 86 Elite 80, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3255
Location: Oceanside/ SF
Tue Jul 09, 2019 9:50 am quote
Run a 122 if youre at sea level. The rest of your 24/24 jetting is spot on. The only reason Iíd say run a higher main jet would be if you have the heart in your air filter drilled OR if you run wide open freeway runs all the time.

Donít worry about the 20/20 carb. Those were installed to meet emission requirements, not engine requirements.
Hooked
1955 Allstate 1958 lambretta 1965 Allstate 1968 sprint
Joined: 20 Jul 2017
Posts: 379
Location: Central california
Tue Jul 09, 2019 12:07 pm quote
Up jetting
I have a 1983 p200 in a 68 sprint....I have the exact same jetting as you, but I run a 122 main in the winter, 125 main in the summer. Summers here can be in the 100ís for many days in a row. I tend to run a bit on the rich side....just to be safe. As MJ said 122 main. You should be right in the ballpark.
Enthusiast
1981 Vespa P200E
Joined: 14 Sep 2010
Posts: 66
Location: Whitby, Canada
Tue Jul 09, 2019 5:20 pm quote
Excellent feedback guys.
So what is the difference between the Dellorto 122 and the SIP 122?
Hooked
1955 Allstate 1958 lambretta 1965 Allstate 1968 sprint
Joined: 20 Jul 2017
Posts: 379
Location: Central california
Tue Jul 09, 2019 6:05 pm quote
Up jetting
Well if your talking about jets Iím not sure there is a difference. I have some of each.
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4870
Location: So Cal
Wed Jul 10, 2019 8:01 am quote
NOSIRRAH wrote:
Excellent feedback guys.
So what is the difference between the Dellorto 122 and the SIP 122?
If you look at them under a magnifying glass youíll see the tips of the nozzles are machined a little differently. BGM jets are different still. I havenít compared the actual tolerances. Havenít noticed any difference in the way they perform.
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